Thank you very much! I can use J-link to download the program on CY8C4025AZI-S413 now, but can not on CY8C4126AZI-S433 ,I can not find out the cause.
What's the error message do you see when program 4126AZI-S433?
The issue may be this part is not added in the supported device in IAR 7.7. The lasted version IAR supports CY8C4126AZI-S433.
Could you please tell me which version? I could not find it in device list on IAR website.
8.11, though the device is not listed on IAR website, it can be found in 8.11.